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Exploratory studies on azido-bridged complexes (Ni2+ and Mn2+) as dual colourimetric chemosensors for S2− and Ag+: combined experimental and theoretical outcomes with real field applications

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Abstract

We report two isostructural dinuclear transition metal complexes [M2(HL)2(N3)4], where M = Ni2+ (BS-1), Mn2+ (BS-2), and HL is (2-methyl-2-((pyridin-2-ylmethyl)amino)propan-1-ol) and investigate them as molecular sensors towards hazardous entities. BS-1 shows high selectivity towards the S2− and Ag+ ions, easily observed by the naked eye colour change and its detection limit in aqueous solutions for the S2− ion was calculated as 0.55 μM with a binding constant of 3.28 × 105 M−1, while the limit for the Ag+ ion is 21.8 μM. Notably, BS-2 shows good selectivity towards the Ag+ ion with a detection limit of 10.84 μM. Spectroscopic and DFT studies shed light on the mechanistic course of interaction between the host and guest entities, suggesting a sulphide-mediated reduction of the azide mechanism. In a nutshell, these simple transition metal complexes were exploited for discriminately detecting hazardous analytes with real field applications in analytical science (via.Dip-Stick” approach) as well as engineering science, which provides a significant contribution in the recent advancement of supramolecular chemistry.

Graphical abstract: Exploratory studies on azido-bridged complexes (Ni2+ and Mn2+) as dual colourimetric chemosensors for S2− and Ag+: combined experimental and theoretical outcomes with real field applications

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Supplementary files

Article information


Submitted
13 Aug 2020
Accepted
17 Aug 2020
First published
19 Aug 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Exploratory studies on azido-bridged complexes (Ni2+ and Mn2+) as dual colourimetric chemosensors for S2− and Ag+: combined experimental and theoretical outcomes with real field applications

N. R. Pandit, S. Bej, A. Mondal, M. Ghosh, G. E. Kostakis, A. K. Powell, P. Banerjee and B. Biswas, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT02846K

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